Drill bit



April 13 192s. 1,580,872

G. R. WATSON DRILL BIT Filed Jan. 2, 1924 1 "I". lu u F194 ior'ne/y.

Patented .13, 1926 A UNITED STATES,

PATENT OFFICE.

GEORGE R. WATSON, OF WATERLOO, IOWA, ASSIGNOR TO ARMSTRONG MANUFACTUR- ING- COMPANY, OF WATERLOO, IOWA.

DRILL BIT.

Application filed January 2, 1924. Serial No. 684,080.

To all whom it may concern:

Be it known that I, GEORGE R. WATSON, a citizen of the United States of America, and a resident of Waterloo, Black Hawk County, Iowa, have invented certain new and useful Improvements in Drill Bits, of which the following is a specification.

My invention relates to improvements in drill-bits, and the object of my improvement is to supply a bit for drilling holes in rocky strata, which is shaped for most effective service under all the conditions of actual use.

This object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the accompanying drawings, in which Figs. 1 and 2 are respectively elevations of the drill and its bit taken at an angle of ninety degrees apart, and Fig. 3 isa plan of the cutting end of the bit. I

The drill 1 of cylindrical shape has a coned threaded shank 2 for meshing with the threaded socket of'a drill-jar or the like, and the -bodv 3 of the drill has the usual oppositely positioned longitudinal grooves or troughs 5 of semi-cylindrical shape endircilg te'minally at the concave anticlinal axial e e apposite sides of the drill are flattened at 4 surrounding said troughs 5, and the bit end of the drill isupset at 6 semi-circularly to cause it to conform' to the cylindrical drill-hole during the progressive movement of the drill.

The cutting edge of the bit at 9 is a dia'met-rical anticlinal ridge with its faces usually between thirty to forty-five degrees angle relative to the longitudinal axis of the drill,-

for use in drilling into rock of varying hardness. v I

The bit 9 projects from sloping anticlinal faces 8 whose angle relative to the axis of the drill is greater than the angle of the faces of the bit 9.

The anticlinal faces 8 serve as crushing faces during the dropping and partial rota tion of the drill in use and also serve to limit the penetration of the diametrical bit 9 into any cracks or crevices which may at times intersect the bottom of the drill-hole.

In the ordinary type of drill-bit where the bit 9 is longer and has no crushing faces such as the faces 8, the bit edge may enter large fragments of the rock which pile up and resist crushing and thus holdlup and prevent further effective progress of lthe drill. I have found this to be a great .im pediment in actual practice, but this is entirely obviated when my said improved drill-bit is employed.

In my improved bit, the semicircularly offset. marginal parts 6 keep the bit centered in the drill-hole, so that but little rocking movement is required of the drill, and the faces 8 when the drill drops effectually crush the tailings to powder which is swept away upwardly by the water circulation. Relatively large fragments which are broken away b the ordinary bit, as above described, cannot be carried away by the water current, andremain in the bottom of the hole without being crushed by the bit. As the faces 8 are of greater angularitv r lqfiva to me drills axis than the faces of the bit ridge 9, a reinforced construction is obtained, and the respective parts are less. liable to chip or fracture during use. 7

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. A well-drilling. tool, comprising an elongated shank having longitudinal grooves on opposite sides meeting at a concave anticlinal edge in the bit-end, said bit-end having oppositely inclined relatively wide GEORGE a. WATSON. 

